- All Known Implementing Classes:
public interface RandomNumberGeneratorA component that can generate random number/byte values as needed. Useful in cryptography or security scenarios where random byte arrays are needed, such as for password salts, nonces, initialization vectors and other seeds. This is essentially the same as a
SecureRandom, and indeed implementations of this interface will probably all use
SecureRandominstances, but this interface provides a few additional benefits to end-users:
- It is an interface rather than the JDK's
SecureRandomconcrete implementation. Implementation details can be customized as necessary based on the application's needs
- Default per-instance behavior can be customized on implementations, typically via JavaBeans mutators.
- Perhaps most important for Shiro end-users, tt can more easily be used as a source of cryptographic seed data,
and the data returned is already in a more convenient
ByteSourceformat in case that data needs to be
RandomNumberGenerator saltGenerator = new
SecureRandomNumberGenerator(); User user = new User(); user.setPasswordSalt(saltGenerator.nextBytes().toBase64()); userDAO.save(user);
All Methods Instance Methods Abstract Methods Modifier and Type Method Description
nextBytes()Generates a byte array of fixed length filled with random data, often useful for generating salts, initialization vectors or other seed data.
nextBytes(int numBytes)Generates a byte array of the specified length filled with random data.
nextBytesGenerates a byte array of fixed length filled with random data, often useful for generating salts, initialization vectors or other seed data. The length is specified as a configuration value on the underlying implementation. If you'd like per-invocation control the number of bytes generated, use the
- a byte array of fixed length filled with random data.
- See Also: